Update newcat.c

Fix NR level for FT-991, according to manual range is 1...15

rigs/yaesu/newcat.c

@@ -4190,7 +4190,8 @@ int newcat_set_level(RIG *rig, vfo_t vfo, setting_t level, value_t val)
             if (is_ft991)
             {
                 fpf = newcat_scale_float(10, val.f);
-                if (fpf > 10) fpf=10;
+                if (fpf > 15) fpf=15;
+                if (fpf < 1) fpf=1;
             }
             else
             {